Poliovirus may be spreading in London; virus detected in sewage for months
Enlarge / A well being employee administers a polio vaccine to a toddler out of ...
Read moreEnlarge / A well being employee administers a polio vaccine to a toddler out of ...
Read moreVaccine-derived polio virus was detected within the environmental surveillance of sewage samples from Kolkata, says ...
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© 2021 Copyright Delhi News Wire